Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 618 · 40 questions

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

1. 1.15 × 14 =
2. 2.33 × 15 =
3. 3.30 × 16 =
4. 4.20 × 16 =
5. 5.13 × 12 =
6. 6.40 × 12 =
7. 7.30 × 12 =
8. 8.31 × 24 =
9. 9.36 × 16 =
10. 10.42 × 14 =
11. 11.24 × 15 =
12. 12.40 × 14 =
13. 13.47 × 15 =
14. 14.48 × 14 =
15. 15.19 × 18 =
16. 16.41 × 24 =
17. 17.34 × 12 =
18. 18.33 × 14 =
19. 19.47 × 18 =
20. 20.40 × 18 =
21. 21.24 × 24 =
22. 22.35 × 18 =
23. 23.15 × 12 =
24. 24.34 × 14 =
25. 25.49 × 18 =
26. 26.27 × 16 =
27. 27.43 × 15 =
28. 28.28 × 15 =
29. 29.49 × 24 =
30. 30.23 × 12 =
31. 31.22 × 24 =
32. 32.37 × 14 =
33. 33.20 × 24 =
34. 34.39 × 24 =
35. 35.25 × 12 =
36. 36.20 × 14 =
37. 37.25 × 16 =
38. 38.14 × 15 =
39. 39.21 × 24 =
40. 40.38 × 15 =

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